Google Bug in SERPs

Noticed some error in Google search engines results page (SERP) today.  Does anyone have experienced this? I just noticed awhile ago while searching at Google. You would see from the screenshot that the Google logo overlaps the search box. Comparing it to the latest Google interface, the left pane options is missing (see screenshot 2). I guess something wrong with my Firefox. Cache cleared but still the same.

Screenshot 1.

Screenshot 2

System Info

OS: Windows 7
Browser: Firefox 3.6.3

Firefox Add-ons

• Alexa Sparky 1.4.9
• Firebug 1.5.0
• Skype Extension